Review: Joyroom 30 watt 10 Ah Powerbank $39

Amazon Affiliate Link: https://amzn.to/3w8yd9R
Price As Reviewed: $39

JOYROOM Portable Charger with Built-in Cable, 10000mAh 30W Fast Charging USB C Battery Pack, Cell Phone Power Bank LED Display for iPhone 15 14 Samsung Galaxy S23 Google Pixel Android Tablet, Black

This is a 10,000 mAh (10AH) portable power bank that can charge one device at up to 27 watts using USB-C power delivery. It has two built in cables (an Apple compatable lightning cable, and a USB-C cable), and a USB-A and USB-C ports.

The USB-A port supports the QuickCharge standard, and the USB-C port & cable support the power delivery standard up to 15 volts.

If you plug in more than one device, they all charge at 5 volts, sharing 3 amps of current (15 watts total). The lightning cable charges at 5 volts and 2.4 amps (12 watts).

When you charge the powerbank via USB-C (port or cable) it will charge at between 18-20 watts.

The display screen is quite dim, so it won't disturb your sleep, but is difficult to read outdoors or any time there is a glare on the screen. It has a 0-100% level indicator (the last digit blinks if the powerbank is charging up) and a lightning bolt indicator when the device is operating at a PD or QC voltage above 5 volts.

I found that it could deliver 31 watt hours (at 5 volts) from the 37 watt hour battery (an efficiency of 83%) and took around 42 watt hours to re-charge. This powerbank is a great choice to charge up one cell phone or tablet, and has the flexibility to charge multiple devices simultaneously at the five volt level. As it can get up to 15 volts on the USB-C PD standard, you can even use it to top up a lot of USB-C powered laptops, just don't expect it to run them for too long as it can only deliver 30 watt hours.